/// <summary>
/// Adds a message to the room
/// <param name="msg"></param>
/// <returns> the id of the new message</returns>
public int AddMsg(Message msg)
{
int count;
lock (messages)
{
count = messages.Count;
messages.Add(msg);
}
return count;
}
/// <summary>
/// Marks the user as inactive
/// </summary>
/// <param name="userID"></param>
/// <returns></returns>
public void LeaveRoom(string userID)
{
//deactivate user
ChatUser user = this.GetUser(userID);
if (user == null)
return;
user.IsActive = false;
user.LastSeen = DateTime.Now;
this.RoomUsers.Remove(userID);
//Add leaving message
Message msg = new Message(user.UserName, "", MsgType.Left);
this.AddMsg(msg);
if (IsEmpty())
ChatEngine.DeleteRoom(this.RoomID);
}
/// <summary>
/// Adds a message in the room
/// </summary>
/// <param name="strMsg"></param>
/// <param name="senderID"></param>
/// <returns>All the messages sent from the other user from the last time the user sent a message</returns>
public string SendMessage(string strMsg, string senderID)
{
ChatUser user = this.GetUser(senderID);
Message msg = new Message(user.UserName, strMsg, MsgType.Msg);
user.LastSeen = DateTime.Now;
this.ExpireUsers(userChatRoomSessionTimeout);
this.AddMsg(msg);
int lastMsgID;
List<Message> previousMsgs = this.GetMessagesSince(user.LastMessageReceived, out lastMsgID);
if (lastMsgID != -1)
user.LastMessageReceived = lastMsgID;
string res = this.GenerateMessagesString(previousMsgs);
return res;
}
/// <summary>
/// Activates the user and adds a join message to the room
/// </summary>
/// <param name="userID"></param>
/// <param name="userName"></param>
/// <returns>All the messages sent in the room</returns>
public string JoinRoom(string userID, string userName)
{
//activate user
ChatUser user = new ChatUser(userID, userName);
user.IsActive = true;
user.UserName = userName;
user.LastSeen = DateTime.Now;
if (!this.RoomUsers.ContainsKey(userID))
{
//Add join message
Message msg = new Message(user.UserName, "", MsgType.Join);
this.AddMsg(msg);
//Get all the messages to the user
int lastMsgID;
List<Message> previousMessages = this.GetMessagesSince(-1, out lastMsgID);
user.LastMessageReceived = lastMsgID;
//return the messages to the user
string str = GenerateMessagesString(previousMessages);
this.RoomUsers.Add(userID, user);
return str;
}
return "";
}
